莎士比亚创作的“四大悲剧”是（）。

A.《哈姆雷特》

B.《罗密欧与朱丽叶》

C.《奥赛罗》

D.《麦克白》

E.《李尔王》

F.《暴风雨》

In order for the automatic lifeboat drain to operate properly（）.

A.the cap should be removed to drain the boat when it is waterborne

B.the cage must be free of rubbish or the ball may not seat properly

C.there is an automatic ball check located in a siphon tube

D.the small lever to release the rubber ball float must be turned counterclockwise